Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate
2002-05-07
2002-11-05
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With light limiting or controlling means
C359S613000, C427S164000, C427S165000
Reexamination Certificate
active
06476980
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of manufacturing a protective lens for a display, and particularly to a method of manufacturing a protective lens for a display that can prevent light from messages from being emitted outside of a predetermined central arc.
2. The Related Art
An electronic device, such as a mobile phone or a pager, usually has a display for showing text or image messages. The messages are displayed using a light source built into the electronic device. A lens for protection covers the display. Conventionally, the lens is a transparent member allowing a user to read messages. The lens may also be formed with laser images to improve the visual effect, as disclosed in Taiwan patent application No. 87220130.
With the growing demand for personal privacy, it is becoming more desirable to have a lens that prevents people from seeing messages shown on a display except from a relatively narrow arc from which the user views the message.
FIGS. 1 and 2
of the attached drawings disclose one such known lens
90
. The lens
90
includes a flat, transparent glass plate
92
and a filtering film
94
adhering to an inner surface of the glass plate
92
. The filtering film
94
is printed with a series of equally spaced ink stripes
98
to block light from being transmitted through the lens
90
except in a narrow central arc, as illustrated in FIG.
1
. Thus a message shown on the display cannot be seen from the sides outside of this arc.
A method of manufacturing the lens
90
will be explained with reference to FIG.
2
. The method comprises the following steps: (1) directly printing ink stripes
98
on a film substrate
96
; (2) cutting the film substrate
96
to form the filtering film
94
; and (3) attaching the filtering film
94
to the glass plate
92
.
However, this direct printing method is only adapted to a flat lens, because the ink stripes
98
are distributed in an equally spaced fashion. In addition, the equally spaced distribution of ink stripes is not suitable for a curved or arcuate lens because the distribution of distances between ink stripes must change for different locations on the arc of the lens to block light outside the same viewing arc as used with the flat lens.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a method of manufacturing a protective lens for a display that can prevent light from messages from being emitted outside of a predetermined central arc.
Another object of the present invention is to provide a method for mass-producing display protective lens having different non-flat configurations.
To achieve the above objects, a method for manufacturing a protective lens for a display is disclosed in the present invention. The protective lens includes a transparent glass substrate and a filtering film attached to an inner surface of the glass substrate. A plurality of parallel ink stripes are formed on a surface of the film and are distributed symmetrically from middle to opposite sides according to a predetermined pattern. The method includes the steps of: (1) providing a mold having a plurality of recesses formed by etching a surface of the mold; (2) filling the recesses of the mold with ink; (3) pressing an elastically deformable body against the mold, thereby attaching the ink in the recesses to the elastically deformable body; (4) pressing the elastically deformable body against a membrane, thereby transferring the ink to the membrane, thus forming a filtering film; (5) attaching the filtering film to a surface of the glass substrate.
These and additional objects, features and advantages of the present invention will become apparent after reading the following detailed description of a preferred embodiment of the invention taken in conjunction with the appended drawings.
REFERENCES:
patent: 4452516 (1984-06-01), Salia-Munoz
patent: 4766023 (1988-08-01), Lu
patent: 4788094 (1988-11-01), Morita et al.
patent: 5204160 (1993-04-01), Rouser
patent: 5254388 (1993-10-01), Melby et al.
patent: 5330799 (1994-07-01), Sandor et al.
patent: 5554432 (1996-09-01), Sandor et al.
Chung Wei Te
Epps Georgia
Hon Hai - Precision Ind. Co., Ltd.
Spector David N.
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